Grid mouseover tooltip with image

Grid mouseover tooltip with image

I was wondering if it is possible to have a mouseover tooltip placed on a cell of a grid such that on a user mouseover of that cell, it will present a thumbnail image. If so, is it possible to have the image contents of this tooltip fetched asynchronously? The images I am working with are 150px X 150px thumbnails between 4 to 5Kb in size residing in a sql server database table.